Here are the most common Japanese menu items you will encounter and their English counterparts:

Even without a full manual, these solutions address frequent complaints:

Many users simply disable the navigation portion and use the unit as an amplifier for an external Bluetooth FM transmitter or AUX input (if available). The screen then serves as a clock and basic radio.

from Panasonic Japan's support site. You can upload this PDF to tools like Google Translate to convert specific pages into English. Changing language for on-screen display

Car Navigation System Operation Manual (English) For imported / Japanese-market units

: Explains general button functions and navigation basics. How to Navigate in English

If you need additional help or have questions about your Panasonic CN-HDS625D, here are some additional resources: